Boxed Transformer Rectifier units from Securefast are suitable for powering door hold-open magnets and some hold-open door closers working to a maximum operating voltage of 27V DC and are available with a 1-, 2- or 4-amp rating with a selectable NO / NC SW input for connection to a fire alarm relay output.
The Securefast ADP324-FR power supply unit is a 24V DC switched-mode 1A power supply specially designed to power magnetic fire alarm door retainers and general 24 Volt DC applications. Supplied in a very compact, attractive, but tough, steel housing with an externally visible status LED. The 24V DC output is designed for the highly inductive loads that magnetic door retainers present, eliminating the need for additional control relays and reducing the chance of an ‘electrical spike’ causing problems, which is a frequent cause of personnel delays and expensive engineer call outs.
The ADP324-FR can handle up to 8 double doors with 16 magnetic door retainers, based on 50 mA each.
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